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Joseph Louis Kersten vs Max Euwe
Amsterdam (1922), Amsterdam NED
King's Indian Defense: Fianchetto Variation. Classical Fianchetto (E67)  ·  1/2-1/2

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Nov-15-12  thomastonk: A very interesting bishop ending starts after Black's 36th move: within the next 20 moves, Black offers almost all of his pawns.

The endgame is about equal until Black's 48.. a3?, where b3 or c3 is correct. With the fine retreat 50.Bc1! White could have won.

And just before the end, White could have tried 57.g5+:


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Now only one move saves the draw, and this move is the counter-intuitive Ke6! Food for thought.

Nov-16-12  thomastonk: I have tried to understand the endgame after 57.g5+ in depth, in particular the move 57.. Ke6!, which I called counter-intuitive yesterday.

Well, roughly speaking, this move delays the decision, how to defend against White's pawns! With a king on e6, Black can (depending on White's next move) control g8 with the king or attack the pawns via f5. Now the details.

The difference between 57.. Ke6! and 57.. Kf5? (or 57.. Ke5?) is the control of g8, see 58.g6 Bf8 59.Kxc2 a2 60.Kb2 Ba3+ 61.Kxa2 Bxc1:


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The difference between 57.. Ke6! and 57.. Kg7? (or 57.. Ke7? or 57.. Kf7) is the distance to f5 after 58.Kxc2 a2 59.Bb2(+). If Black has played 57.. Ke6!, then 59.. Kf5 and 59.. Bf8 lead both to a drawn position, because Black can eliminate White's pawns. Here is the drawn position after 59.. Kf5:


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Finally, if Black played the king to the seventh rank, then White's win is not straightforward. After 57.. Kg7? 58.Kxc2 a2 59.Bb2+ Kh7, White's only winning move is 60.Bf6!, and now the final try 60.. Be7 61.Kb2 Bxf6+ 62.gxf6 yields a lost pawn ending:


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Note that Black has unique defences after 60.Kb3? Be7! and 60.g6+? Kh6!.

On the other hand, after 59.. Kf7 60.Bf6? Be7! works for Black. However, here 60.Kb3, 60.g6+ and others win.

Chess is wonderfull.

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